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Micro Nutrient Fertilizer

  • 1.  Micro Nutrient Fertilizer

    Posted 07-20-2019 08:48

    We have facing an issue of disposing waste water sludge from paper industry following is the composition of the sludge, it contains some micro nutrients such as Fe,Mg,Cl and Organics as in the image. I would like to do a research on this to convert sludge to fertilizer. What will be the scope of this fertilizer ?

    Ajithkumar S

  • 2.  RE: Micro Nutrient Fertilizer

    Posted 07-23-2019 20:08
    Is there any information on what the organics are? Anything possibly pathogenic or hazardous to the crop(s) proposed for the fields?

  • 3.  RE: Micro Nutrient Fertilizer

    Posted 07-24-2019 09:19
    The percentages don't make sense as they don't add up to 100%. If the analysis reported the levels in parts per million that would probably be best. Some sludge can be converted to fertilizers but the application of it depends on the local environmental regulations. Generally it's easier to use a waste water stream as a fertilizer before the sludge settles out and becomes more concentrated. You have to look at more than just what it could do to the crops. Anything you place on the ground can make it's way into aquifers and your drinking water.

    Considering your sludge has some heavier metals like Fe, Al, and ash that may be an issue. Typically those are more regulated. The CaCO3 is just from the water hardness but I typically don't see Mg reported as MgCO3. The acid insoluble components is a bit interesting as well. You would need to know more about what they're referring to there.

    The dry solid basis may not be the best way to analyze it if it's really better to apply it as a wet sludge. ​Depending on how the percentages really add up, if the level of organics is that high and it contains R2O3 groups it may be possible to turn the sludge into a bio fuel.

    How is the sludge currently disposed of? Is it placed in a landfill or incinerated?

    James Burtnett-Grigsby PE
    Chemical Process Engineer
    Maumee OH